Hydrofarm JSHC48 JumpStart Soil Heating Cable, 48-Feet, Black Place in ground to speed germination and seedling growth with gentle heat Perfect indoors or out, this cable is 48 feet long, safely encased in a tough, waterproof PVC coating with orange color for visibility Cover the cable with 3 to 4 inches of soil, then plant your seeds, seedlings, or plants above this height It is designed to last for many seasons, offering an economical and effective solution to the problem of cold weather slowing down your garden